javascript - 检查cookie数组元素是否存在

Question

如何检查 cookie 中是否已存在数组元素？

这是我的代码:

var cookieList = function (cookieName) {
    var cookie = Cookies.get(cookieName);
    var items = cookie ? cookie.split(/,/) : new Array();

    return {
        "add": function (val) {
            items.push(val);
            Cookies.set(cookieName, items.join(','), { path: '/' });
        }
    }
}

var list = new cookieList("MyItems");

$('.items').on('click', '.add', function () {
    var imageId = $(this).data("id");
    list.add(JSON.stringify(imageId));
});

Answer 1

您可以向cookieList 添加一个方法exists，然后使用Array. indexOf()

var cookieList = function (cookieName) {
    var cookie = Cookies.get(cookieName);
    var items = cookie ? cookie.split(/,/) : new Array();

    return {
        "add": function (val) {
            items.push(val);
            Cookies.set(cookieName, items.join(','), {
                path: '/'
            });
        },
        exists: function (val) {
            return items.indexOf(val) > -1
        }
    }
}

var list = new cookieList("MyItems");

$('.items').on('click', '.add', function () {
    var imageId = $(this).data("id");
    list.add(JSON.stringify(imageId));
    var exists = list.exists(JSON.stringify(imageId))
});

演示:Fiddle